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Optimization of pulsed electric field pre‐treatments to enhance health‐promoting glucosinolates in broccoli flowers and stalk
Author(s) -
AguilóAguayo Ingrid,
Suarez Manuel,
Plaza Lucia,
Hossain Mohammad B,
Brunton Nigel,
Lyng James G,
Rai Dilip K
Publication year - 2015
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6891
Subject(s) - glucosinolate , electric field , stalk , horticulture , chemistry , food science , mathematics , biology , physics , brassica , quantum mechanics
BACKGROUND The effect of pulsed electric field ( PEF ) treatment variables (electric field strength and treatment time) on the glucosinolate content of broccoli flowers and stalks was evaluated. Samples were subjected to electric field strengths from 1 to 4 kV cm −1 and treatment times from 50 to 1000 µs at 5 Hz. RESULTS Data fitted significantly ( P < 0.0014) the proposed second‐order response functions. The results showed that PEF combined treatment conditions of 4 kV cm −1 for 525 and 1000 µs were optimal to maximize glucosinolate levels in broccoli flowers (ranging from 187.1 to 212.5%) and stalks (ranging from 110.6 to 203.0%) respectively. The predicted values from the developed quadratic polynomial equation were in close agreement with the actual experimental values, with low average mean deviations (E%) ranging from 0.59 to 8.80%. CONCLUSION The use of PEF processing at moderate conditions could be a suitable method to stimulate production of broccoli with high health‐promoting glucosinolate content. © 2014 Society of Chemical Industry